AST1002 Chapter 5: Radiation and Spectra

1.       What is the speed of light in a vacuum?

• A. 300,000 meters per second.

• B. 3,000 meters per second.

• C. 30,000 meters per second.

• D. 300 meters per second.

1.       What is the wavelength of green light?

• A. 400 nm.

• B. 500 nm.

• C. 600 nm.

• D. 700 nm.

1.       What is the main difference between emission and absorption spectra?

• A. Emission spectra show bright lines on a dark background, while absorption spectra show dark lines on a bright background.

• B. Emission spectra show dark lines on a bright background, while absorption spectra show bright lines on a dark background.

• C. Emission spectra and absorption spectra are the same thing.

• D. None of the above.

1.       What is the primary factor that determines the temperature of a star's surface?

• A. Its mass.

• B. Its distance from Earth.

• C. Its age.

• D. None of the above.

1.       Which type of electromagnetic radiation has the shortest wavelength?

• A. X-rays.

• B. Ultraviolet radiation.

• C. Visible light.

• D. Radio waves.

1.       What is a blackbody spectrum?

• A. A spectrum produced by a hot, dense gas.

• B. A spectrum produced by a cool, sparse gas.

• C. A continuous spectrum produced by a hot, dense object.

• D. None of the above.

1.       What is the main factor that determines the color of a star?

• A. Its temperature.

• B. Its distance from Earth.

• C. Its mass.

• D. None of the above.

1.       What is the difference between a red giant and a white dwarf?

• A. A red giant is hotter and more massive than a white dwarf.

• B. A white dwarf is hotter and more massive than a red giant.

• C. A red giant is cooler and more massive than a white dwarf.

• D. A white dwarf is cooler and more massive than a red giant.

1.       What is the difference between a continuous spectrum and a line spectrum?

• A. A continuous spectrum contains all colors of light, while a line spectrum contains only certain colors.

• B. A continuous spectrum contains only certain colors of light, while a line spectrum contains all colors.

• C. A continuous spectrum and a line spectrum are the same thing.

• D. None of the above.

1.       What is the name of the law that states that a hot, dense object will produce a continuous spectrum?

• A. Wien's law.

• B. Stefan-Boltzmann law.

• C. Planck's law.

• D. None of the above.